Method and apparatus for RRM measurement enhancement for NR unlicensed

Abstract

A method of a user equipment (UE) in a wireless communication system is provided. The method comprises: receiving, from a base station (BS), a set of radio resource control (RRC) parameters comprising at least one measurement object (MO); identifying, based on the at least one MO, at least one modulo value for synchronization signals and physical broadcast channel (SS/PBCH) blocks, and at least one bitmap indicating indices of the SS/PBCH blocks; identifying a set of SS/PBCH block locations based on the at least one modulo value and the at least one bitmap; performing radio resource management (RRM) measurement based on the identified set of SS/PBCH block locations; and transmitting, to the BS via an uplink channel, a measurement report message including a result of the RRM measurement.

What is claimed is: 
     
       1. A user equipment (UE) in a wireless communication system, the UE comprising:
 a transceiver configured to receive, from a base station (BS), a set of radio resource control (RRC) parameters comprising at least one measurement object (MO); and 
 at least one processor operably connected to the transceiver, the at least one processor configured to:
 identify, based on the at least one MO, at least one modulo value for synchronization signals and physical broadcast channel (SS/PBCH) blocks, and at least one bitmap indicating indices of the SS/PBCH blocks, 
 identify a set of SS/PBCH block locations based on the at least one modulo value and the at least one bitmap, and 
 determine whether to perform radio resource management (RRM) measurement on the identified set of SS/PBCH block locations, wherein:
 the RRM measurement is performed on an SS/PBCH block location of the set of SS/PBCH block locations, if an index of the SS/PBCH block location after performing a modulo operation based on the identified at least one modulo value is the same as one of the indices of SS/PBCH blocks indicated by the at least one bitmap, or 
 the RRM measurement is not performed on the SS/PBCH block location of the set of SS/PBCH block locations, if the index of the SS/PBCH block location after performing the modulo operation based on the identified at least one modulo value is not the same as one of the indices of SS/PBCH blocks indicated by the at least one bitmap, 
 
 
 wherein the transceiver is further configured to transmit, to the BS via an uplink channel, a measurement report message including a result of the RRM measurement. 
 
     
     
       2. The UE of  claim 1 , wherein each of the at least one modulo value is derived from {1, 2, 4, 8}. 
     
     
       3. The UE of  claim 1 , wherein:
 the at least one processor is further configured to identify at least one SS/PBCH block based measurement timing configuration (SMTC); and 
 the identified set of SS/PBCH block locations is determined to be confined within the SMTC. 
 
     
     
       4. The UE of  claim 3 , wherein, during performing the RRM measurement based on the identified at least one SMTC, the at least one processor is further configured to:
 identify a secondary synchronization signal (SSS) in the at least one SS/PBCH block and at least one demodulation reference signal (DMRS) that is quasi-co-located (QCLed) with the SSS; and 
 calculate at least one of reference signal received power (RSRP) or reference signal received quality (RSRQ) based on the identified SSS and DMRS. 
 
     
     
       5. The UE of  claim 1 , wherein:
 the at least one processor is further configured to identify, based on the at least one MO, at least one receive signal strength indicator measurement timing configuration (RMTC) for receive signal strength indicator (RSSI) measurement; and 
 the RMTC includes a measurement unit associated with a numerology including a cyclic prefix length and a subcarrier spacing. 
 
     
     
       6. The UE of  claim 5 , wherein each of the at least one RMTC is determined for a sub-band with a 20 MHz bandwidth for a cell belonging to the BS. 
     
     
       7. A base station (BS) in a wireless communication system, the BS comprising:
 a transceiver configured to:
 transmit, to a user equipment (UE), a set of radio resource control (RRC) parameters comprising at least one measurement object (MO); and 
 receive, from the UE via an uplink channel, a measurement report message including a result of radio resource management (RRM) measurement; and 
 
 at least one processor operably connected to the transceiver, the at least on processor configured to:
 configure, based on the at least one MO, at least one modulo value for synchronization signals and physical broadcast channel (SS/PBCH) blocks, and at least one bitmap indicating indices of the SS/PBCH blocks, and 
 identify the result of the RRM measurement that is performed on a set of SS/PBCH block locations, wherein the set of SS/PBCH block locations are determined based on the configured at least one modulo value and the at least one bitmap, wherein:
 the RRM measurement is performed on an SS/PBCH block location of the set of SS/PBCH block locations, if an index of the SS/PBCH block location after performing a modulo operation based on the configured at least one modulo value is the same as one of the indices of SS/PBCH blocks indicated by the at least one bitmap, or 
 
 the RRM measurement is not performed on the SS/PBCH block location of the set of SS/PBCH block locations, if the index of the SS/PBCH block location after performing the modulo operation based on the configured at least one modulo value is not the same as one of the indices of SS/PBCH blocks indicated by the at least one bitmap. 
 
 
     
     
       8. The BS of  claim 7 , wherein each of the at least one modulo value is derived from {1, 2, 4, 8}. 
     
     
       9. The BS of  claim 7 , wherein:
 the at least one processor is further configured to configure at least one SS/PBCH block based measurement timing configuration (SMTC); and 
 the set of SS/PBCH block locations is determined to be confined within the SMTC. 
 
     
     
       10. The BS of  claim 9 , wherein, during identifying the result of the RRM measurement based on the configured at least one SMTC, the at least one processor is further configured to:
 indicate a secondary synchronization signal (SSS) in the at least one SS/PBCH block and at least one demodulation reference signal (DMRS) that is quasi-co-located (QCLed) with the SSS is identified; and 
 indicate at least one of reference signal received power (RSRP) or reference signal received quality (RSRQ) based on the indicated SSS and DMRS is calculated. 
 
     
     
       11. The BS of  claim 7 , wherein:
 the at least one processor is further configured to configure, based on the at least one MO, at least one receive signal strength indicator measurement timing configuration (RMTC) for receive signal strength indicator (RSSI) measurement; and 
 the RMTC includes a measurement unit associated with a numerology including a cyclic prefix length and a subcarrier spacing. 
 
     
     
       12. The BS of  claim 11 , wherein each of the at least one RMTC is configured for a sub-band with a 20 MHz bandwidth for a cell belonging to the BS. 
     
     
       13. A method of a user equipment (UE) in a wireless communication system, the method comprising:
 receiving, from a base station (BS), a set of radio resource control (RRC) parameters comprising at least one measurement object (MO); 
 identifying, based on the at least one MO, at least one modulo value for synchronization signals and physical broadcast channel (SS/PBCH) blocks, and at least one bitmap indicating indices of the SS/PBCH blocks; 
 identifying a set of SS/PBCH block locations based on the at least one modulo value and the at least one bitmap; 
 determining whether to perform radio resource management (RRM) measurement on the identified set of SS/PBCH block locations, wherein:
 the RRM measurement is performed on an SS/PBCH block location of the set of SS/PBCH block locations, based on a determination that an index of the SS/PBCH block location after performing a modulo operation based on the identified at least one modulo value being the same as one of the indices of SS/PBCH blocks indicated by the at least one bitmap, or 
 the RRM measurement is not performed on the SS/PBCH block location of the set of SS/PBCH block locations, based on a determination that the index of the SS/PBCH block location after performing the modulo operation based on the identified at least one modulo value not being the same as one of the indices of SS/PBCH blocks indicated by the at least one bitmap; and 
 
 transmitting, to the BS via an uplink channel, a measurement report message including a result of the RRM measurement. 
 
     
     
       14. The method of  claim 13 , wherein each of the at least one modulo value is derived from {1, 2, 4, 8}. 
     
     
       15. The method of  claim 13 , further comprising identifying at least one SS/PBCH block based measurement timing configuration (SMTC), wherein the identified set of SS/PBCH block locations is determined to be confined within the SMTC. 
     
     
       16. The method of  claim 15 , during performing the RRM measurement based on the identified at least one SMTC, further comprising:
 identifying a secondary synchronization signal (SSS) in the at least one SS/PBCH block and at least one demodulation reference signal (DMRS) that is quasi-co-located (QCLed) with the SSS; and 
 calculating at least one of reference signal received power (RSRP) or reference signal received quality (RSRQ) based on the identified SSS and DMRS. 
 
     
     
       17. The method of  claim 13 , further comprising identifying, based on the at least one MO, at least one receive signal strength indicator measurement timing configuration (RMTC) for receive signal strength indicator (RSSI) measurement, wherein:
 the RMTC includes a measurement unit associated with a numerology including a cyclic prefix length and a subcarrier spacing; and 
 each of the at least one RMTC is determined for a sub-band with a 20 MHz bandwidth for a cell belonging to the BS.